Power amount measurement system, power amount measurement method, and power amount measurement device

Patent metadata

Field	Value
Publication number	US-11715957-B2
Application number	US-202117165409-A
Country	US
Kind code	B2
Filing date	Feb 2, 2021
Priority date	Feb 4, 2020
Publication date	Aug 1, 2023
Grant date	Aug 1, 2023

Abstract

When a baseline is in a certain state, a server executes a process including: a step of calculating an amount of power exchanged between a battery and a power grid during the first charging control; a step of calculating an amount of power exchanged between the battery and the power grid during the second charging control; a step of calculating an amount of power exchanged between the battery and the power grid during the first power feeding control; a step of calculating an amount of power exchanged between the battery and the power grid during the second power feeding control; and a step of setting a calibration line for the amount of power.

First claim

What is claimed is:

1. A power amount measurement system comprising:
a smart meter that measures an amount of power exchanged between a power grid and a connection target of the power grid;
a power storage device that is one of a plurality of electrical devices included in the connection target;
a power conversion device that adjusts power to be exchanged between the power grid and the power storage device; and
a server that obtains a measurement result of the smart meter and that controls the power conversion device, wherein
when a baseline indicating power consumption of an electrical device is in a certain state, the server instructs the power conversion device to execute first control to control the power conversion device, whereby the power conversion device exchanges power with a first amount of power being employed as an instruction value, the electrical device being other than the power storage device and included in the connection target,
the server obtains, from the smart meter, a first measurement result about an amount of power exchanged during an execution period of the first control,
when the baseline is in the certain state, the server instructs the power conversion device to execute second control to control the power conversion device, whereby the power conversion device exchanges power with a second amount of power being employed as the instruction value, the second amount of power being different from the first amount of power,
the server obtains, from the smart meter, a second measurement result about an amount of power exchanged during an execution period of the second control,
the server determines, using the first measurement result and the second measurement result, a relation between the instruction value and a measurement value of the amount of power exchanged between the power grid and the power storage device, and
the certain state is when a magnitude of an amount of change in the amount of power measured by the smart meter per predetermined period is less than or equal to a predetermined value with charging and discharging of the power storage device being halted.

2. The power amount measurement system according to claim 1 , wherein the server sets, using the first measurement result and the second measurement result, a calibration line indicating the relation between the instruction value and the measurement value.

3. The power amount measurement system according to claim 2 , wherein when the baseline is brought out of the certain state during execution of at least one of the first control and the second control, the server does not set the calibration line using the first measurement result and the second measurement result.

4. The power amount measurement system according to claim 1 , wherein by instructing the power conversion device to execute the first control and the second control multiple times, the server obtains a plurality of measurement results about the amount of power exchanged during the execution period of the first control and the amount of power exchanged during the execution period of the second control.

5. The power amount measurement system according to claim 4 , wherein the server obtains each of the first measurement result and the second measurement result using a third measurement result of the plurality of measurement results, the third measurement result indicating that a difference between the instruction value and the measurement value being less than or equal to a threshold value.

6. A power amount measurement method employing a smart meter that measures an amount of power exchanged between a power grid and a connection target of the power grid, a power storage device that is one of a plurality of electrical devices included in the connection target, and a power conversion device that adjusts power to be exchanged between the power grid and the power storage device,
the power amount measurement method comprising:
when a baseline indicating power consumption of an electrical device is in a certain state, executing first control to control the power conversion device, whereby the power conversion device exchanges power with a first amount of power being employed as an instruction value, the electrical device being other than the power storage device and included in the connection target;
obtaining, from the smart meter, a first measurement result about an amount of power exchanged during an execution period of the first control;
when the baseline is in the certain state, executing second control to control the power conversion device, whereby the power conversion device exchanges power with a second amount of power being employed as the instruction value, the second amount of power being different from the first amount of power;
obtaining, from the smart meter, a second measurement result about an amount of power exchanged during an execution period of the second control; and
determining, using the first measurement result and the second measurement result, a relation between the instruction value and a measurement value of the amount of power exchanged between the power grid and the power storage device, and wherein:
the certain state is when a magnitude of an amount of change in the amount of power measured by the smart meter per predetermined period is less than or equal to a predetermined value with charging and discharging of the power storage device being halted.

7. A power amount measurement device for obtaining a measurement result of a smart meter that measures an amount of power exchanged between a power grid and a connection target of the power grid and for providing an execution instruction for predetermined control to a power conversion device that adjusts power to be exchanged between the power grid and a power storage device, the power storage device being one of a plurality of electrical devices included in the connection target, wherein
when a baseline indicating power consumption of an electrical device is in a certain state, the power amount measurement device instructs the power conversion device to execute first control to control the power conversion device, whereby the power conversion device exchanges power with a first amount of power being employed as an instruction value, the electrical device being other than the power storage device and included in the connection target,
the power amount measurement device obtains, from the smart meter, a first measurement result about an amount of power exchanged during an execution period of the first control,
when the baseline is in the certain state, the power amount measurement device instructs the power conversion device to execute second control to control the power conversion device, whereby the power conversion device exchanges power with a second amount of power being employed as the instruction value, the second amount of power being different from the first amount of power,
the power amount measurement device obtains, from the smart meter, a second measurement result about an amount of power exchanged during an execution period of the second control,
the power amount measurement device determines, using the first measurement result and the second measurement result, a relation between the instruction value and a measurement value of the amount of power exchanged between the power grid and the power storage device, and
the certain state is when a magnitude of an amount of change in the amount of power measured by the smart meter per predetermined period is less than or equal to a predetermined value with charging and discharging of the power storage device being halted.

8. A power amount measurement device for communicating with a server that obtains a measurement result of a smart meter that measures an amount of p

Assignees

• Toyota Motor Co Ltd

Inventors

• Kinomura Shigeki
• Kitaoka Hironobu
• Nakamura Toru
• Kusumi Hidetoshi
• Tsuchiya Yoshiyuki

Classifications

• H02J2105/10

  Local stationary networks having a local or delimited stationary reach · CPC title

• H02J13/1335

  involving a local wireless network, e.g. Wi-Fi®, ZigBee® or Bluetooth® · CPC title

• H02J13/333

  the equipment forming part of substations · CPC title

• H02J13/12

  Monitoring network conditions, e.g. electrical magnitudes or operational status · CPC title

• H02J7/90

  Regulation of charging or discharging current or voltage · CPC title